The ringleader of a gang of pirates suspected of robbing and murdering a British kayaker in the Amazon has been killed, Brazilian police have said. Evanilson Gomes da Costa – a 24-year-old known as Baia – was one of seven gang members who police believe murdered Emma Kelty, a former headteacher from north London. Da Costa was shot twice in the early hours of Wednesday morning at his home in the remote town of Coari and later died in hospital, police said.